Peeling of Acrylic Pressure Sensitive Adhesives: Cross-Linked versus Uncross-Linked Adhesives

Verdier, Claude; Piau, Jean‐Michel; Benyahia, Lazhar

doi:10.1080/00218469808029581

Cited by 36 publications

(31 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…When a polymer structure changes from a non-crosslinked to a crosslinked state, its ability to come into intimate contact with the substrate by viscoelastic deformation and viscous ow is reduced, while its cohesive strength is enhanced; thus, a mode of interfacial failure may be favored. Similar results were also reported from the study on acrylate based PSAs [9]. The above studies suggest a possible correlation between rheological properties and peel strength.…”

Section: Introductionsupporting

confidence: 89%

A new method based on application of cyclic strain to evaluate the durability of pressure sensitive adhesives

Sohn¹

2003

Journal of Adhesion Science and Technology

View full text Add to dashboard Cite

The development of PSAs suitable for speci c applications requires an optimization of the two most essential properties: suf cient bond strength and clean removability. The latter is conveniently obtained by controlling the mode of debonding to an interfacial failure, yet the issue of bond strength is challenging since the optimum bond strength must be available in the same failure mode. More complication arises from the fact that the methods, such as peel and creep tests, used to evaluate the bond strength are often qualitative and the results obtained may not accurately reveal the effects of various PSA design parameters. In the present study, a new method, named cyclic strain application (CSA) test, is devised to evaluate the durability of PSAs. A key feature of this test is that by applying a controlled cyclic strain on a PSA / substrate interface we can quantitatively monitor the temporal stress variation as well as the time for interfacial failure (t f ). As a result, the effects of various PSA design parameters, such as molar mass, blending with low molar mass fractions, adhesion promoters, and the level of crosslinking on PSA durability can be clearly seen. Other factors being equal, higher molar mass samples showed greater t f , while, blending with low molar mass fractions led to a reduced t f . The use of a strong adhesion promoter, as anticipated, increased t f . However, it should be noted that excessive bond strength may lead to a cohesive failure, which is detrimental in the design of good PSAs. From a comparison of t f with peel strength, it was clearly shown that t f , the key parameter obtained from the CSA test, had a strong correlation with peel strength. In addition, some other information, such as the detailed in uences of the level of crosslinking and molar mass on PSA durability was also obtained from the CSA test. Lastly, some important PSA design concepts and other examples utilizing the CSA test are presented.

show abstract

Section: Introductionsupporting

confidence: 89%

A new method based on application of cyclic strain to evaluate the durability of pressure sensitive adhesives

Sohn¹

2003

Journal of Adhesion Science and Technology

View full text Add to dashboard Cite

show abstract

“…A first explanation for this transition in the peeling modes could be the sensitivity of peeling and fibrillation processes to the shear rate. In the context of the peeling of uncrosslinked PSA, Verdier and coworkers 22,30 have reported the formation of threedimensional instabilities in the form of fingers, when the pulling velocity was increased, which are consistent with the present observations: when the film thickness was reduced from 100 to 20 lm while keeping constant the displacement rate (v ¼ 10 lm/s), the applied nominal shear rate was increased by a factor of 5, and at the same time, fibrillation was strongly enhanced. Moreover, an examination in the lowdisplacement regime (i.e., in a region where the shear response is dominated by the bulk film behavior) of the curves reported in Figure 10 provides some indication of a significant sensitivity of the rheological response of material B to strain rate.…”

Section: Peeling Mechanismsmentioning

confidence: 99%

Investigation of shear failure mechanisms of pressure‐sensitive adhesives

Sosson

Chateauminois

Creton

2005

J Polym Sci B Polym Phys

View full text Add to dashboard Cite

We report new experiments investigating the failure mechanisms in shear, of thin layers of acrylic pressure-sensitive adhesives (PSA). We have developed a novel experimental device able to shear a soft adhesive layer confined between a rigid hemispherical lens and a rigid glass substrate. Using the resources of in situ contact visualization, the nonhomogeneous deformation of the layer and the shear failure processes were observed optically. Depending on the rheological properties of the adhesive, ratios of the contact radius over the layer thickness of 10-30 were achieved, mimicking well the contact conditions encountered in a thin adhesive layer within a joint. When the adhesive was weakly crosslinked, we observed a fluid-like behavior and could measure a reasonable value for the viscosity of the PSA, implying that flow can occur in the layer and failure will occur by creep. On the other hand, for a more crosslinked adhesive, closer to what is used in applications, a stick-slip peeling behavior was observed, which involves a coupling between peeling mechanisms at the leading edge of the contact and interfacial slippage. Such a process suggests a failure by fracture rather than by creep. Interestingly, the peeling mechanisms and the associated stress levels change significantly when the layer becomes as thin as 20 lm, implying a fracture process that is controlled by a critical energy release rate in shear G IIc rather than by a critical shear stress causing failure of the interfacial bonds.

show abstract

“…Besides, the cross-linked PSAs undergo decomposition above certain temperatures. Owing to the formation of chemical bonds, an increase in cohesion can be obtained during the curing of the PSA coating layer in the drying step, in which the cross-linking reaction occurs [16,17]. Figure 4 also illustrates the influences of crosslinking reagents on the heat resistance of PSA.…”

Section: Influence Of Cross-linking Reagents On Properties Of Psasmentioning

confidence: 99%

Properties of solvent-borne acrylic pressure-sensitive adhesives synthesized by a simple approach

Jin¹,

Bai²,

Shao³

et al. 2009

Express Polym. Lett.

View full text Add to dashboard Cite

Abstract. Acrylic polymers are widely used for fabricating pressure-sensitive adhesives (PSAs) with the inherent unique advantages of transparency and superior intrinsic adhesive properties over other polymer-based adhesives. In this study, we have developed and evaluated a method of obtaining by radical copolymerization PSAs for liquid crystalline (LCD) applications. Various factors including the amount of monomers, amount of cross-linker, coating weight, dwell time and thermal treatment are investigated for further optimizing the properties of acrylic polymer based PSAs to meet the emerging strict requirements for practical uses related mainly to holding powder and peel strength. The results illustrate that novel crosslinking reagents coupled with the thermal treatment at 70°C can make the resultant PSAs with the improved adhesive properties. The coating weight variation from 10 to 40 g/m 2 can significantly enhance the peel strength from 4.0 g/25 mm to 12.5 g/25 mm with about 310% increment. If the dwell time of PSAs with cross-linking reagent is more than 10 hrs, the peel strength can be reduced down to a suitable value to meet the criterion for use. Therefore, acrylic PSAs with peel strength less than 20 g/25 mm and holding power above 120 hrs were successfully synthesized by elaborately designing the reaction system, which are practically applicable for advanced industrial applications.

show abstract

Peeling of Acrylic Pressure Sensitive Adhesives: Cross-Linked versus Uncross-Linked Adhesives

Cited by 36 publications

References 21 publications

A new method based on application of cyclic strain to evaluate the durability of pressure sensitive adhesives

A new method based on application of cyclic strain to evaluate the durability of pressure sensitive adhesives

Investigation of shear failure mechanisms of pressure‐sensitive adhesives

Properties of solvent-borne acrylic pressure-sensitive adhesives synthesized by a simple approach

Contact Info

Product

Resources

About